Effects of Aluminizing on the High Temperature Oxidation Behavior of High Silicon Cast Iron

Abstract:

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In this study, the aluminizing of high silicon cast iron by hot-dipping in pure Al melt was performed and their high temperature oxidation behaviour was tested at 750 °C for virous exposure time. After high temperature oxidation tests, the microstructure analysis of all samples were investigated by means of metallographical examination, scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectrometer (EDS) and X-ray diffractometry (XRD).The results showed that the coating layers consisted of three layer, in the sequence of Al, Fe-Al and Si-rich layers from external topcoat to substrate. Nodules graphite had a blocking effect to retard the outward diffusion of Fe atoms and impeded the growth of Fe2Al5 in C-axis. Eventually, the cast iron substrate was oxidized directly by oxygen penetration via the greater cracks and pores to form Fe oxide nodules after 750 °C oxidation for 48h.

Info:

Periodical:

Advanced Materials Research (Volumes 79-82)

Edited by:

Yansheng Yin and Xin Wang

Pages:

2151-2154

DOI:

10.4028/www.scientific.net/AMR.79-82.2151

Citation:

M. B. Lin and C. J. Wang, "Effects of Aluminizing on the High Temperature Oxidation Behavior of High Silicon Cast Iron", Advanced Materials Research, Vols. 79-82, pp. 2151-2154, 2009

Online since:

August 2009

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Price:

$35.00

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